研究了钛表面Ni-P合金镀层的热处理工艺，通过分析镀层的表面形貌及物相组成，探讨了热处理温度等关键因素对Ni-P合金镀层硬度的影响。研究结果表明，在300℃热处理时，电镀时间为1 h的镀层中只有Ni5 P4相和Ni，无Ni3 P相，电镀时间为2 h和3 h的镀层中仅有少量的Ni3 P相；在400℃热处理时，镀层均由大量Ni3 P相和微量Ni组成；400℃热处理后的镀层硬度高于镀态和300℃热处理后的硬度；电镀时间为2 h，热处理温度为400℃时， Ni-P镀层硬度最高，维氏硬度达到8938 MPa。
The effect of heat treatment temperature on Ni-P coating hardness was investigated by analyzing the surface morphology and phase composition of the coating .The results show that , after heat treatment at 300 ℃, the coating is constitute of Ni5 P4 and Ni when electroplated for 1 h and the coating contain only a small amount of Ni 3 P when the electroplating time is 2 h and 3 h.After heat treatment at 400 ℃, the coating is constitute of a large amount of Ni 3 P and trace amounts of Ni .The hardness of Ni-P coating after heat treatment at 400 ℃is higher than heat treatment at 300 ℃and non-treatment condition . When the electroplating time is 2 h the Vickers-hardness of the coating is 8 938 MPa after heat treatment at 400 ℃.
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